Baked Blueberry Buttermilk Oatmeal

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Baked Blueberry Buttermilk Oatmeal made with rolled oats, blueberries and cinnamon is hearty, filling, and tasty enough for breakfast, a snack, or even dessert.


Baked Blueberry Buttermilk Oatmeal is the recipe you want to make when you are getting tired of your daily bowl of oats. Baking oatmeal does magical things and turns your normal oatmeal into the most delicious breakfast. Try this version or opt for Baked Apple Cinnamon Oatmeal or Strawberry Banana Baked Oatmeal.

Baked oatmeal is one of my favorite weekend breakfast dishes.  Usually, I make it with whatever fruit I have in the house - chopped apples, bananas, peaches, strawberries - you name it.  Sometimes I throw in some nuts, seeds, chocolate chips (!), pumpkin puree, or applesauce.  It's one of those recipes you can mix up a million ways. 

However lately to really make it sing, I have been using buttermilk instead of just regular skim milk or almond milk and I am in love with the result.   It adds some extra creaminess and that delicious buttermilk tang that is so delicious in pancakes and biscuits. It is something you will want to try immediately.

This particular Blueberry Buttermilk Baked Oatmeal was actually inspired by a craving for my favorite buttermilk blueberry pancakes from a diner near our house. I woke up wanting nothing else but a huge stack of these famous pancakes but since I had already been planning on making some kind of baked oatmeal dish, I decided to take my inspiration from the pancakes instead of heading out for what would surely be a thousand calorie breakfast. And I am so glad I did.

These simple baked oats really do explode with flavor from the combination of rolled oats, brown sugar, buttermilk, cinnamon, and tons of blueberries. It's warm, comforting, and almost tastes like it could be dessert. If you topped it with some whipped cream or a dollop of vanilla frozen yogurt, it could definitely be a dessert. And we often enjoy it as an afternoon snack with a cup of coffee to beat the afternoon slump. 

Can you bake oatmeal?

Oatmeal can absolutely be baked and it is honestly one of the best ways to enjoy oatmeal in my opinion. When oatmeal is baked, it becomes almost cake-like, while still maintaining the shape and texture of the oats. The reason this happens is that baked oatmeal recipes generally have eggs to bind the oatmeal together and give it a more bar or cake-like texture. This can vary from recipe to recipe depending on the exact combination of dry ingredients, wet ingredients, and eggs, but generally baked oatmeals are less liquidy than traditional stovetop or microwave oats.

Baked blueberry oatmeal in a glass dish with blueberries on the side.

Can you freeze baked oatmeal?

Believe it or not, it is actually really easy to freeze individual servings of baked oatmeal to pull out for quick breakfasts and snacks. Once you have cooked the oatmeal, let it cool completely and cut it into squares. Then place the squares on a baking sheet and let the bars freeze in the open air in the freezer for at least two hours. This process removes some of the moisture and allows the outer edges to freeze so the bars won't stick together. Then place the bars in a freezer-safe bag or container and store in the freezer for up to 3 months. 

To reheat frozen baked oatmeal, pop the square in the microwave for 1-1.5 minutes depending on the strength of your microwave. You can also use the toaster oven.

If you are hoping to freeze an entire tray of baked oatmeal in advance, you can freeze the whole pan before cooking it. Then simply defrost it in the fridge the night before you want to cook it and then cook, adding about 10 minutes to the cooking time. If the oatmeal looks at all dry before baking, you can add some extra milk. This sometimes happens since the oatmeal had time to absorb more of the liquid.

Topping Ideas for Baked Blueberry Oatmeal

There are so many different fun ways to top this oatmeal. These are some of my favorites:

  • Greek yogurt: To add some extra protein, I like serving this with Greek yogurt. Usually I reach for plain but it's also good with coconut, vanilla, lemon, and blueberry.
  • Nut butter: Another way to add some protein and healthy fats is with nut butter. I like to pop mine in the microwave for a few seconds before hand and drizzle it over the top.
  • Chopped nuts: For some crunch, you can either add nuts to the oatmeal before baking or just serve it with some nuts on top. Delish.
The Recipe
Baked blueberry oatmeal with rolled oats and blueberries on a plate.

Baked Blueberry Buttermilk Oatmeal

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  • 1.5 cups old-fashioned oatmeal
  • 1/2 tsp. baking powder
  • 1/2 tsp. cinnamon
  • 1/3 cup brown sugar (or maple syrup)
  • 1/4 tsp. salt
  • 3/4 cup buttermilk
  • 3/4 cup nonfat milk (or almond milk)
  • 2 eggs, whisked
  • 1.5 cups fresh blueberries

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Preheat the oven to 350 degrees.


Mix together the oats, baking powder, cinnamon, brown sugar, and salt.


In another bowl mix together the buttermilk, nonfat milk, and eggs.


Add the wet ingredients to the oats. Fold in the blueberries.


Pour into an 8 X 8 baking dish and bake for 30-35 minutes until cooked through and golden brown on top.

Nutritional Facts
Serving Size: 1 slice
Amount Per Serving
Calories 192
Calories from Fat 30
% Daily Value *
Total Fat 4g
Saturated Fat 1g
Monounsaturated Fat 0g
Polyunsaturated Fat 0g
Cholesterol 64mg
Sodium 205mg
Total Carbohydrate 35g
Dietary Fiber 3g
Sugars 19g
Protein 7g

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Nutritional Values provided are estimates only and may vary based on the preparation method.

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About the author Meet Kristen McCaffrey
Hi, I’m the cookbook author, recipe developer, and food enthusiast behind Slender Kitchen. I am obsessed with making healthy food that is easy to prepare and absolutely delicious. Meal planning is my secret weapon and I hope I can make meal time easier for you with our tried and tested recipes and foolproof meal plans. Learn More
On Baked Blueberry Buttermilk Oatmeal
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November 19, 2023 - 15:07
I added two more eggs and hemp hearts. Crushed walnuts for the top. My pan is larger so I hope it turns out. Has defrosted blueberries too.
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Kiki Magner
November 17, 2022 - 15:15
really good simple keeper recipe. thank you!
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Jennifer Wallace
June 15, 2020 - 12:40
Add a Rating:
I just made this today and it is delicious! I love cinnamon and added a little more, but it’s sweet but not too sweet and the fresh blueberries really make it worth it. When I added the recipe as written to the recipe maker thing in WW it turned out to be six points on the blue plan but it’s worth it!
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May 20, 2020 - 13:52
I’m going to try this tomorrow but am thinking of replacing the brown sugar with stevia (fruit sugar), as I am diabetic.
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October 1, 2018 - 17:54
Has anyone tried this with frozen blueberries?
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November 19, 2023 - 15:06
I did. It was thawed berries I took out and I’m sure it will be fine? It’s baking right now. Might need a bit longer. It’s winter here and berries are not in season so I buy frozen.
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Rosa Romero
September 24, 2018 - 20:34
This looks great and I’ll be making it as soon as I buy the ingredients. What size baking dish did you use?
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Lauren S
September 24, 2018 - 16:21
What size baking dish do you use?
It looks delicious and can't wait to try it!
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September 24, 2018 - 19:47
Thanks so much! Just updated the recipe to include the dish size - 8 X 8. Hope you enjoy it!
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